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Full-Text Articles in Science and Technology Studies
Improved Hydrogen Storage Properties Of Mgh2 Doped With Chlorides Of Transition Metals Hf And Fe, M Ismail Ismail, Yue Zhao, Xuebin Yu, S X. Dou
Improved Hydrogen Storage Properties Of Mgh2 Doped With Chlorides Of Transition Metals Hf And Fe, M Ismail Ismail, Yue Zhao, Xuebin Yu, S X. Dou
Shi Xue Dou
The effects of HfCl4 and FeCl3 addition on the de/rehydrogenation properties of MgH2 were investigated. Both HfCl4 and FeCl3-doped MgH2 samples started to released hydrogen at about 270 °C, a decreased of about 70 °C and about 140 °C compared to as-milled and as-received MgH2, respectively. In terms of the desorption kinetics, the HfCl4-doped MgH2 sample showed significant improvement, with 6.0 wt.% hydrogen released within 10 min at 300 °C, while the FeCl3-doped MgH2 and undoped MgH2 samples released 3.5 and 0.2 wt.% hydrogen, respectively, under the same conditions. In terms of the absorption kinetics, 5.5 wt.% hydrogen was charged …
Electrospun P2-Type Na 2/3 (Fe 1/2 Mn 1/2 )O 2 Hierarchical Nano Fibers As Cathode Material For Sodium-Ion Batteries, Sujith Kalluri, Kuok Hau Seng, Wei Kong Pang, Zaiping Guo, Zhixin Chen, Hua-Kun Liu, S X. Dou
Electrospun P2-Type Na 2/3 (Fe 1/2 Mn 1/2 )O 2 Hierarchical Nano Fibers As Cathode Material For Sodium-Ion Batteries, Sujith Kalluri, Kuok Hau Seng, Wei Kong Pang, Zaiping Guo, Zhixin Chen, Hua-Kun Liu, S X. Dou
Shi Xue Dou
Sodium-ion batteries can be the best alternative to lithium-ion batteries, because of their similar electrochemistry, nontoxicity, and elemental abundance and the low cost of sodium. They still stand in need of better cathodes in terms of their structural and electrochemical aspects.
Large Piezoelectric Coefficient And Ferroelectric Nanodomain Switching In Ba(Ti0.80zr0.20)O3-0.5(Ba0.70ca 0.30)Tio3 Nanofibers And Thin Films, A Jalalian, A Grishin, Xiaolin Wang, Zhenxiang Cheng, S X. Dou
Large Piezoelectric Coefficient And Ferroelectric Nanodomain Switching In Ba(Ti0.80zr0.20)O3-0.5(Ba0.70ca 0.30)Tio3 Nanofibers And Thin Films, A Jalalian, A Grishin, Xiaolin Wang, Zhenxiang Cheng, S X. Dou
Shi Xue Dou
Currently available low-dimensional piezoelectric materials show a low piezoelectric coefficient d33 of merely 100 pm V-1 with Pb(Zr, Ti)O3-based materials at the high end. Here, we report very large piezoelectricity in Ba(Ti0.80Zr0.20)O 3-0.5(Ba0.70Ca0.30)TiO3 (BTZ-0.5BCT) lead-free nanostructures sintered as thin films (d33 = 140 pm V -1) and nanofibers (d33 = 180 pm V-1). The influences of lateral size, geometry, and the clamping effect on the piezoelectric performance were investigated for both thin films and nanofibers. Combining a high piezoelectric coefficient with environmental benefits, the BTZ-0.5BCT nanostructures provide the superior functions sought for highly efficient piezoelectric devices and electromechanical systems. 2014 …
Large Networks Of Vertical Multi-Layer Graphenes With Morphology-Tunable Magnetoresistance, Zengji Yue, Igor Levchenko, Shailesh Kumar, Donghan Seo, Xiaolin Wang, S X. Dou, Kostya Ken Ostrikov
Large Networks Of Vertical Multi-Layer Graphenes With Morphology-Tunable Magnetoresistance, Zengji Yue, Igor Levchenko, Shailesh Kumar, Donghan Seo, Xiaolin Wang, S X. Dou, Kostya Ken Ostrikov
Shi Xue Dou
We report on the comparative study of magnetotransport properties of large-area vertical few-layer graphene networks with different morphologies, measured in a strong (up to 10 T) magnetic field over a wide temperature range. The petal-like and tree-like graphene networks grown by a plasma enhanced CVD process on a thin (500 nm) silicon oxide layer supported by a silicon wafer demonstrate a significant difference in the resistance-magnetic field dependencies at temperatures ranging from 2 to 200 K. This behaviour is explained in terms of the effect of electron scattering at ultra-long reactive edges and ultra-dense boundaries of the graphene nanowalls. Our …